Supporting the OpenvSwitch datapath kernel module packages on Ubuntu 12.04 whilst ensuring compatibility with the hardware enablement kernels that we push out for each point release has been challenging; the patch set I had to implement on top of 1.4.0 to support the Quantal 3.5 kernel was not insignificant!
The upstream provided datapath kernel module is important for OpenStack users as it provides support for overlay networking using GRE tunnels which is used extensively by Neutron for separation of Layer 2 tenant networks. Right now the native kernel module does not support this feature (although that is being worked on – hopefully for 14.04 we can drop the datapath module provided by upstream completely).
For the Raring 3.8 kernel that will ship with the Ubuntu 12.04.3 point release we are taking a slightly different approach; instead of patching the hell out of the 1.4.0 OpenvSwitch datapath module again, we will be providing specific packages for the Raring HWE kernel.
If you currently use the openvswitch-datapath-dkms module and want to switch to the Raring HWE kernel then you will need to take the following action:
sudo apt-get install openvswitch-datapath-lts-raring-dkms
There is also an equivalent openvswitch-datapath-lts-raring-source .. cntd
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